Describes the unpredictable and varied changes in the world or in life, often implying the ephemeral nature of things.
几十年过去，家乡已是鱼龙曼羡，旧时的小路变成了宽阔的大道，高楼大厦拔地而起。
Decades have passed, and my hometown has undergone immense changes; old narrow paths have become wide avenues, and skyscrapers have risen from the ground.
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